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Nullpointer exception when sending string

Hi there,

I hope someone can help me because I'm struggeling to solve this issue.

I have a client/server application where I send a command to a server where is executes a certain method. The client is a JSp page which initializes a Client class where the command is send to. It is this Client class which gives me a nullpointer exception where I can't lay my finger on.

The issue comes when I use the "sendCommand(String c)" method from the Client class which gives the following error in Tomcat 7:
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HTTP Status 500 -